Glucoside wastewater decolorization method

Abstract

A glucoside wastewater decolorization method relates to the technical field of wastewater treatment, and adopts the technical scheme that the method comprises the following steps: S1, determining whether a color developing substance is dissolved in water or not; s2, if the color developing substance is dissolved in water, treating the wastewater sample by using different types of decolorizing agents, and determining the optimal decolorizing agent with the best decolorizing effect and the concentration of the optimal decolorizing agent; if the chromogenic substance is discharged along with the flocculation precipitate, treating the wastewater sample by using different types of flocculants, and determining the optimal flocculant with the best decoloration effect and the use concentration of the optimal flocculant; and S3, determining the optimal decolorizing agent or the optimal flocculating agent dosage according to the wastewater flow, adding the optimal decolorizing agent or the optimal flocculating agent dosage into the wastewater treatment process, sampling and detecting at a water outlet, and further adjusting the optimal decolorizing agent or optimal flocculating agent adding mode. The problem that the color degree of glucoside wastewater subjected to wastewater treatment is too high is solved, the adding mode of the decolorizing agent is optimized, and the conditions of peculiar smell and foam are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly relates to a method for decolorizing glycoside wastewater. Background Art

[0002] When the applicant produces a glycoside product, the produced glycoside wastewater is colorless, but an unknown chromogenic substance is generated during the wastewater treatment process, which raises the chromaticity of the treated wastewater to about 300, seriously exceeding the standard of 50 for wastewater discharge chromaticity, affecting the normal production of the company, and urgently needing to solve the problem of high chromaticity of the wastewater. Summary of the Invention

[0003] Aiming at the problem of excessively high chromaticity of wastewater in the prior art solution, the present invention provides a method for decolorizing glycoside wastewater.

[0004] The present invention provides the following technical solution: A method for decolorizing glycoside wastewater, comprising the following steps: S1, adding a flocculant to aggregate suspended substances in the wastewater sample, detecting the change in chromaticity of the clarified liquid, and determining whether the chromogenic substance is soluble in water; S2, if the chromogenic substance is soluble in water, treating the wastewater sample with different types of decolorizing agents to determine the best decolorizing agent and its concentration with the best decolorizing effect; if the chromogenic substance is discharged with the flocculation precipitate, treating the wastewater sample with different types of flocculants to determine the best flocculant and its usage concentration with the best decolorizing effect; S3, determining the dosage of the best decolorizing agent or the best flocculant according to the wastewater flow rate, adding it to the wastewater treatment process, sampling and detecting at the drainage outlet, and further adjusting the adding method of the best decolorizing agent or the best flocculant.

[0005] Preferably, in S1, the flocculant is polyaluminum chloride and polyacrylamide.

[0006] Preferably, in S2, the decolorizing agents include dicyandiamide formaldehyde resin, activated carbon, and sodium hypochlorite, and the best decolorizing agent is sodium hypochlorite.

[0007] Preferably, in S3, the adding method of the best decolorizing agent is: further diluting the sodium hypochlorite to a maximum concentration of 5% according to the dosage, and then adding it to the decolorizing agent adding point on the wastewater drain pipe with a length of at least 30 m from the adding point to the drainage outlet to mix with the wastewater.

[0008] The beneficial effect of the present invention is: solving the problem of excessively high chromaticity of the glycoside wastewater after wastewater treatment, and optimizing the adding method of the decolorizing agent to avoid the occurrence of peculiar smell and foam. Brief Description of the Drawings

[0009] Figure 1 It is a result diagram of an embodiment of the flocculant precipitation experiment.

[0010] Figure 2 It is a result diagram of an embodiment of the decolorization experiment of the decolorizing agent. Specific embodiments

[0011] The following further elaborates on the embodiments of the present invention in conjunction with the attached drawings and reference numerals, enabling those skilled in the art to implement it after studying this specification. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0012] The present invention provides a method for decolorizing glycoside wastewater, including the following steps: S1. After taking the wastewater sample and stirring it evenly, divide it into three parts with the same volume for each part. Add mixed flocculants of polyaluminum chloride and polyacrylamide with different concentrations to do precipitation experiments respectively, and then take the clarified liquid to detect the change in the colority of the clarified liquid. The experimental results are as Figure 1 shown, Figure 1 In the experimental results on the left and in the middle, the lower layer is the precipitate and the upper layer is the yellow clarified liquid. It can be seen that the clarified liquid still has a relatively high colority after the aggregated suspended matter, and the colority has almost no change compared with the wastewater sample, indicating that the coloring substances are completely dissolved in water.

[0013] S2. After taking the wastewater sample and stirring it evenly, divide it into multiple parts with the same volume for each part. Use dicyandiamide formaldehyde resin, activated carbon, and sodium hypochlorite with different concentrations as decolorizing agents to treat multiple wastewater samples respectively, and then detect the change in colority. The best experimental results of the three different decolorizing agents are as Figure 2 shown, Figure 2 The result of the treatment with dicyandiamide formaldehyde resin is on the left. Although the colority is reduced, it is still yellowish and does not meet the discharge standard; Figure 2 The result of the treatment with sodium hypochlorite is in the middle. The colority improvement is the most obvious, meeting the discharge standard, and the concentration of the decolorizing agent is 0.3%; Figure 2 The result of the treatment with activated carbon filtration is on the right. The decolorization effect is not good, showing a dark brown color, and the flow rate is low. It can be known from the experiment that the best decolorizing agent is sodium hypochlorite.

[0014] S3. Select a position at least 30 m away from the drainage outlet in the existing wastewater treatment operation drainage pipe as the decolorizing agent addition point, and determine the dosage of sodium hypochlorite according to the wastewater flow rate in the drainage pipe and the usage concentration determined in S2. The applicant found that when directly adding the purchased sodium hypochlorite solution with a concentration of 10% into the drainage pipe from the decolorizing agent addition point according to the dosage, the wastewater sample obtained at the drainage outlet has an odor and a lot of foam. After reducing the dosage of the sodium hypochlorite solution, the problems of odor and foam have not been solved. Therefore, the addition method of sodium hypochlorite needs to be further adjusted.

[0015] A series of sodium hypochlorite solutions with the same dosage but varying concentrations in a gradient manner are added to the drainage pipe from the decolorizer addition point every 1 hour in sequence, and samples are taken at the drainage outlet for testing. The concentration gradients are set as follows: 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%. The test results are shown in Table 1. After diluting the sodium hypochlorite solution to a concentration of 5% or lower, both the decolorization effect can be achieved, and the problems of odor and chromaticity can be eliminated.

[0016] Table 1: Experimental Results of Concentration Gradients

[0017] The above are one or more embodiments of the present invention, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. A method for decolorizing glycoside wastewater, characterized in that, It includes the following steps: S1. Add a flocculant to aggregate suspended substances in the wastewater sample, detect the change in the colority of the clarified liquid, and determine whether the chromogenic substance is soluble in water; S2. If the chromogenic substance is soluble in water, treat the wastewater sample with different types of decolorants to determine the best decolorant and its concentration with the best decolorization effect; if the chromogenic substance is discharged with the flocculation precipitate, treat the wastewater sample with different types of flocculants to determine the best flocculant and its application concentration with the best decolorization effect; S3. Determine the dosage of the best decolorant or the best flocculant according to the wastewater flow rate, add it to the wastewater treatment process, take samples at the drainage outlet for detection, and further adjust the addition method of the best decolorant or the best flocculant.

2. The glycoside wastewater decolorization method according to claim 1, characterized in that In S1, the flocculant is polyaluminum chloride and polyacrylamide.

3. A glycoside wastewater decolorization method according to claim 1, characterized in that In S2, the decolorants include dicyandiamide formaldehyde resin, activated carbon and sodium hypochlorite, and the best decolorant is sodium hypochlorite.

4. A method for decolorizing glycoside wastewater according to claim 3, characterized in that In S3, the addition method of the best decolorant is: further dilute the sodium hypochlorite to a maximum concentration of 5% according to the dosage, and then add it to the decolorant addition point on the wastewater drain pipe with a length of at least 30 m from the addition point to the drainage outlet to mix with the wastewater.

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